Key Area 1.3 Gene expression

Question 1

What is gene expression

Answer 1

-Gene expression is basically the making of proteins
-Gene expression invlove having to transcribe and translate DNA sequences ( not all genes in a cell are expressed)
-Transcription and translation involve 3 different types of RNA:
mRNA-Messenger
tRNA-Transfer
rRNA-Ribosomel

Question 2

What is RNA

Answer 2

• RNA is the second type of nucleic acid on the cell
• RNA plays a vital role in the production of proteins
• RNA is very similar to DNA except deoxyribose sugar is replaced with ribose sugar

Question 3

What is messenger RNA (mRNA)-ROLE

Answer 3

Messenger RNA is formed in the nucleus from free nucleotides and carries a copy of the DNA code to the nucleus to the ribosome (where protein synthesis occurs)

Question 4

What is transfer RNA (tRNA)-ROLE

Answer 4

Transfer RNA collects amino acids and then brings them to the ribosome so that proteins can be created

Question 5

What is Ribosomal RNA (rRNA)-ROLE

Answer 5

Ribosomal RNA combines with proteins to create ribosomes- the organelle is responsible for the assembly of proteins following the code of DNA

Question 6

What is transcription

Answer 6

• transcription is the synthesis of mRNA from a section of the DNA
• the transcription begins at a region of DNA called a promoter
• A gene is a section of DNA which carries the code for the production of one protein

Question 7

What is RNA polymerase

Answer 7

RNA polymerase is responsible for transcriptions. RNA